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| author | Sean Anderson <seanga2@gmail.com> | 2020-06-24 06:41:21 -0400 |
|---|---|---|
| committer | Andes <uboot@andestech.com> | 2020-07-01 15:01:22 +0800 |
| commit | ab24017a19b482d9026d21a2ec03416c5c4a388d (patch) | |
| tree | 184985446d435f4d6a54275dc635b87d25d55106 /drivers/cpu/riscv_cpu.c | |
| parent | 958a3f464c7f8ef7e10db9feb663e9e80445ce2f (diff) | |
| download | u-boot-ab24017a19b482d9026d21a2ec03416c5c4a388d.tar.gz u-boot-ab24017a19b482d9026d21a2ec03416c5c4a388d.tar.xz u-boot-ab24017a19b482d9026d21a2ec03416c5c4a388d.zip | |
riscv: Try to get cpu frequency from a "clocks" node if it exists
Instead of always using the "clock-frequency" property to determine cpu
frequency, try using a clock in "clocks" if it exists. This patch also
fixes a bug where there could be spurious higher frequencies if sizeof(u32)
!= sizeof(ulong).
Signed-off-by: Sean Anderson <seanga2@gmail.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Diffstat (limited to 'drivers/cpu/riscv_cpu.c')
| -rw-r--r-- | drivers/cpu/riscv_cpu.c | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/drivers/cpu/riscv_cpu.c b/drivers/cpu/riscv_cpu.c index cb04f5638d..2d44d1c17b 100644 --- a/drivers/cpu/riscv_cpu.c +++ b/drivers/cpu/riscv_cpu.c @@ -3,6 +3,7 @@ * Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com> */ +#include <clk.h> #include <common.h> #include <cpu.h> #include <dm.h> @@ -11,6 +12,7 @@ #include <dm/device-internal.h> #include <dm/lists.h> #include <linux/bitops.h> +#include <linux/err.h> DECLARE_GLOBAL_DATA_PTR; @@ -29,9 +31,24 @@ static int riscv_cpu_get_desc(struct udevice *dev, char *buf, int size) static int riscv_cpu_get_info(struct udevice *dev, struct cpu_info *info) { + int ret; + struct clk clk; const char *mmu; - dev_read_u32(dev, "clock-frequency", (u32 *)&info->cpu_freq); + /* Zero out the frequency, in case sizeof(ulong) != sizeof(u32) */ + info->cpu_freq = 0; + + /* First try getting the frequency from the assigned clock */ + ret = clk_get_by_index(dev, 0, &clk); + if (!ret) { + ret = clk_get_rate(&clk); + if (!IS_ERR_VALUE(ret)) + info->cpu_freq = ret; + clk_free(&clk); + } + + if (!info->cpu_freq) + dev_read_u32(dev, "clock-frequency", (u32 *)&info->cpu_freq); mmu = dev_read_string(dev, "mmu-type"); if (!mmu) |